Baltimore Harbor Tunnel, Road tunnel under Patapsco River in Baltimore, United States.
The Baltimore Harbor Tunnel is a road tunnel that runs under the Patapsco River with two parallel tubes, each containing two lanes for Interstate 895. It provides a direct passage for traffic crossing between the two shores of the waterway.
The tunnel opened in 1957 after prefabricated concrete sections were submerged into a trench on the harbor floor. The project resolved a long-standing traffic problem that had caused congestion in the downtown area since the 1940s.
This transportation infrastructure project addressed the Baltimore Bottleneck problem of the 1940s, transforming the movement of vehicles through the urban core.
Driving through the tunnel is straightforward and the passage is open continuously without special conditions. Vehicles equipped with electronic toll systems pay different rates than those without transponder technology.
The tunnel system includes sensors that monitor air quality and machinery that maintains fresh air inside. This ventilation system is necessary to ensure safe passage for the large volume of vehicles daily.
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